li {
    list-style: none;
}
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,legend,button
form,input,p,th,td {
    padding: 0;
    margin: 0;
}
body {
    cursor: default;
    background-color: #bfd2f0;
    height: 1000px;
}
a {
    cursor: pointer;
}
.w {
    width: 800px;
    margin: 0 auto;
    position: relative;
    display: flex;
}
#top {
    background: white;
    box-shadow: #bfd2f0 2px 2px 10px;
    text-align: center;
    position: fixed;
    width: 100%;
    z-index: 100;
}
#top button {
    float: right;
    border: 0px;
    padding: 0;
    height: 40px;
    width: 80px;
    background: beige;
}
#top .w{
    height: 25px;
}
#top #icon {
    float: left;
    height: 25px;
    width: 25px;
    vertical-align: bottom;
}
#nav {
    display: flex;
}
#nav button{
    display: inline-block;
    margin-left: 5px;
}
#leftContent {
    width: 200px;
    height: 500px;
    border: #b3d7ff 3px solid;
    background: #545b62;
}
#returnTofriend:hover {
    transition: 0.2s;
    color: whitesmoke;
}
#returnTofriend {
    transition: 0.2s;
    color: midnightblue;
    cursor: pointer;
}
#slideContent li:hover{
    transition: 0.2s;
    background: #d3d9df;
}
#slideContent li {
    transition: 0.1s;
    border-radius: 3px;
    padding-left: 10px;
}
#mianContent {
    width: 600px;
}

.covers-rack {
    width: 110px;
    height: 150px;
}
.books:hover {
    transition: 0.3s;
    box-shadow: #202326 3px 3px 5px;
}
.name-rack {
    font-size: 14px;
    margin-left: 10px;
}
.author-rack {
    font-size: 10px;
    margin-left: 10px;
}
#bookRack {
    display: flex;
}
.books {
    transition: 0.15s;
    margin: 10px 10px 0px 20px;
    padding: 3px;
    box-shadow: #202326 1px 1px 1px;
    height: 200px;
}

